Starting processes using Cfengine
Problem
You want to ensure that a process is running.
Creating links using Cfengine
Problem
You Cfengine binaries are in /var/cfengine/bin but you want them in the PATH.
A brief overview of Red Hat Enterprise Virtualization
Red Hat Enterprise Virtualization is a fairly new product offering from Red Hat. Red Hat acquired RHEV when they purchased Qumranet in September 2008. Qumranet created KVM when they created a Windows desktop virtualization product . RHEV is the evolution of that product and in the hands of Red Hat it offers a virtualization solution for both desktops and servers, Linux and Windows.
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Solaris and Sun/Oracle cheatsheet
Init levels
| 0 | Go into boot prompt (OK). |
| 1 | Put the system in system administrator mode. All file systems are mounted. Only a small set of essential kernel processes are left running. This mode is for administrative tasks such as installing optional utility packages. All files are accessible and no users are logged in on the system. |
| 2 | Put the system in multi-user mode. All multi-user environment terminal processes and daemons are spawned. This state is commonly referred to as the multi-user state. |
| 3 | Start the remote file sharing processes and dae mons. Mount and advertise remote resources. Run level 3 extends multi-user mode and is known as the remote-file-sharing state. |
| 4 | Is available to be defined as an alternative multi-user environment configuration. It is not necessary for system operation and is usually not used. |
| 5 | Shut the machine down so that it is safe to remove the power. Have the machine remove power, if possible. |
| 6 | Stop the operating system and reboot to the state defined by the initdefault entry in /etc/inittab. |
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Reboot and issue boot -x (boot to non-cluster mode) at boot prompt. |
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Reboot and issue `boot -xs` (single user, non-cluster mode) at boot prompt. |
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Reboot and issue boot -r (reconfigure) at boot prompt. |
Enterprise system administration using configuration management
To maintain the large quantity of servers typically found in enterprise organizations, systems administration must move beyond manual and custom scripts toward a centralized configuration management service. This move can save an organization considerable time and money.
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